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Hello Everybody,

Does anyone know where to find a detailed algorithm description for
Wav file compatible ADPCM?

Thanks,

Dirk

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dbell wrote:

> Hello Everybody,
> 
> Does anyone know where to find a detailed algorithm description for
> Wav file compatible ADPCM?

ADPCM is a class of algorithms, not a particular algorithm,

There are at least 20 different ADPCM algorithms which can 
be used in a WAV file container. Which one in particular do
you mean?

Erik
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Hi Erik,

What I am looking for is the algorithm description including data
packing format for

WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)

Any guidance would be appreciated.

Thanks,

Dirk


On Oct 29, 6:11 pm, Erik de Castro Lopo <er...@mega-nerd.com> wrote:
> dbell wrote:
> > Hello Everybody,
>
> > Does anyone know where to find a detailed algorithm description for
> > Wav file compatible ADPCM?
>
> ADPCM is a class of algorithms, not a particular algorithm,
>
> There are at least 20 different ADPCM algorithms which can
> be used in a WAV file container. Which one in particular do
> you mean?
>
> Erik
> --
> -----------------------------------------------------------------
> Erik de Castro Lopo
>
-----------------------------------------------------------------http://en.wikipedia.org/wiki/Why_I_Am_Not_a_Christianht
tp://en.wikipedia.org/wiki/Why_I_Am_Not_a_Muslimhttp://en.wikipedia.org/wiki/Strong_atheism

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dbell wrote:

> What I am looking for is the algorithm description including data
> packing format for
> 
> WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)

All I can offer you is good luck as that is one of the many ADPCM
algorithms I have never seen documentation or code for.

However, if you have a PCM -> WAVE_FORMAT_MEDIASPACE_ADPCM encoder
and a WAVE_FORMAT_MEDIASPACE_ADPCM -> PCM decoder then reverse
engineering the decoder is usually pretty easy. I'd even offer to 
do it for you for a fee :-).

Erik
-- 
-----------------------------------------------------------------
Erik de Castro Lopo
-----------------------------------------------------------------
C++: The power, elegance and simplicity of a hand grenade.

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Look at ffmpeg source code, there are at least 5 different ADPCM
implementations to choose from including the CCITT G.726.



>dbell wrote:
>
>> What I am looking for is the algorithm description including data
>> packing format for
>> 
>> WAVE_FORMAT_MEDIASPACE_ADPCM (0x0012)
>
>All I can offer you is good luck as that is one of the many ADPCM
>algorithms I have never seen documentation or code for.
>
>However, if you have a PCM -> WAVE_FORMAT_MEDIASPACE_ADPCM encoder
>and a WAVE_FORMAT_MEDIASPACE_ADPCM -> PCM decoder then reverse
>engineering the decoder is usually pretty easy. I'd even offer to 
>do it for you for a fee :-).
>
>Erik
>-- 
>-----------------------------------------------------------------
>Erik de Castro Lopo
>-----------------------------------------------------------------
>C++: The power, elegance and simplicity of a hand grenade.
>

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